Outer surface of a platform



FIG. 1 is a perspective view of an outer surface of a platform showingmy new design;

FIG. 2 is a right side elevational view of the outer surface of aplatform of FIG. 1; the left side elevational view being a mirror imagethereof;

FIG. 3 is a front elevational view of the outer surface of a platform ofFIG. 1; and,

FIG. 4 is a top plan view of the outer surface of a platform of FIG. 1.

The broken lines represent that the pattern of the claimed design isrepetitive throughout its length. The separation and bracket representthat the claimed platform is of variable width.

The ornamental design for an outer surface of a platform, as shown anddescribed.